He prayed on his own and leading others when he was junub; what does he have to do?

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Praying deliberately when one is not taahir is a major sin but it is not kufr
Did it ever happen that the Prophet (peace and blessings of Allaah be upon him) started to pray when he was junub by mistake?

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Related Answers:
He led the people in prayer when he did not have wudoo’, by mistake
How should I pray when I am on board an airplane and its direction keeps changing?
The qiblah of the mosque is different from that indicated by the compass
Praying deliberately when one is not taahir is a major sin but it is not kufr
Did it ever happen that the Prophet (peace and blessings of Allaah be upon him) started to pray when he was junub by mistake?

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